November 3, 2021 · Applied Cybernetics Group
CVE-2021-26411 — Microsoft Internet Explorer
known ransomware use
Microsoft Internet Explorer Memory Corruption Vulnerability
- Added to KEV
2021-11-03- Federal due date
2021-11-17- Vendor
- Microsoft
- Product
- Internet Explorer
- EPSS
- 99.6th percentile (score 0.808, as of
2026-09-16) - NVD CVSS v3.1
- 8.8 (HIGH)
- Ransomware use
- Known
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2021-26411
CISA short description
Microsoft Internet Explorer contains an unspecified vulnerability that allows for memory corruption.
Required action
Apply updates per vendor instructions.
NVD description
Internet Explorer Memory Corruption Vulnerability